As you may or may not know, I developed a Movable Type plugin a while back called MT-Moderate, to help me with the growing tide of comment spam. The plugin is simple. It's only 3KB, and involves installing only a single file on your server. No special modules are needed, and it works immediately upon installation. MT-Blacklist is great and Jay did a simply amazing job, but let's face it - I don't want to spend the time installing it or maintaining it. Enter MT-Moderate.
The idea behind the plugin is remarkably simple: Older entries typically have higher placement in search engines, a feature desired by spammers, so don't allow new comments without checking them first. If, by some chance, a valid comment was left recently on an older entry, and it has been approved, then allow more comments on that same entry, assuming the conversation has picked up again. Some people like to close comments on old entries, and that's not a bad idea, but it means that those occasional valid comments that do come in won't ever be left. I don't like that. Handling it this way actually addresses that.
You see, for the most part, older entries don't get (valid) comments. They get spam comments. As the entries move into your archives, people don't often find them when they are reading your blog. Out of sight, out of mind and all that. They might be found through a search, either on your blog, or through an external search engine such as Google, but I have found it very rare that people who find your blog through those methods will leave a comment.
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